Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f3266df354cea3…

MALICIOUS

PDF

78.6 KB Created: 2021-02-17 03:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6eabab33cc761bafb236ab5271889b9e SHA-1: 51703e2d7745bcd5095007b0a5e34f1d7006d61c SHA-256: 00f3266df354cea362edfff32763a28c84671000013d7267012f9a164e7d10a3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for information or lead users to further malware. No scripts were extracted, and the document body was heavily obfuscated, making the primary attack vector the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/aws?utm_term=fluke+435+analyzer+price In PDF document text
    • http://pifozuvarivin.22web.org/new_odia_song_2018_video_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_602449f7ea7bc.pdfIn PDF document text
    • http://kogovokuriboti.22web.org/79834803481.pdfIn PDF document text
    • http://yesstore.pro/armitron_watch_pro_sport_manualnbbay.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/6927752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_601657688888d.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/no_mans_sky_exo_fahrzeug_terminalesogn.pdfIn PDF document text
    • http://instapriz.website/90885664727vvbzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd80cd4c0242.pdfIn PDF document text
    • http://workshop-fb.ru/pexofafpa3cj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_60044c38e0dd4.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/cca56004b65dd5.pdfIn PDF document text
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/pukafobatat.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/0ac999ecb89f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5fdc989d6f02d.pdfIn PDF document text
    • https://forakisoja.weebly.com/uploads/1/3/2/7/132740641/powuvefuladano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_600eef7693b66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/20_shipping_container_home_plans.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/69732075709.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 5296 bytes
SHA-256: 4c07043806d94e31daac2cfd09bfe36261b77b0773349e855029c9fd169af66b
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16576 bytes
SHA-256: a4478d49626bd5ade75082dff0a7a087ff2a57094af1f365c34106dd29b31d05

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